/*
   Copyright (c) 2003, 2025, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is designed to work with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have either included with
   the program or referenced in the documentation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include <ndb_global.h>

#include <ctime>

#include <FileLogHandler.hpp>
#include <util/File.hpp>

//
// PUBLIC
//
FileLogHandler::FileLogHandler(const char *aFileName, int maxNoFiles,
                               long maxFileSize, unsigned int maxLogEntries)
    : LogHandler(),
      m_maxNoFiles(maxNoFiles),
      m_maxFileSize(maxFileSize),
      m_maxLogEntries(maxLogEntries) {
  m_pLogFile = new File_class(aFileName, "a+");
}

FileLogHandler::~FileLogHandler() { delete m_pLogFile; }

bool FileLogHandler::open() {
  bool rc = true;

  if (m_pLogFile->open()) {
    if (isTimeForNewFile()) {
      if (!createNewFile()) {
        setErrorCode(errno);
        rc = false;
      }
    }
  } else {
    setErrorCode(errno);
    rc = false;
  }

  return rc;
}

bool FileLogHandler::is_open() { return m_pLogFile->is_open(); }

bool FileLogHandler::close() {
  bool rc = true;
  if (!m_pLogFile->close()) {
    setErrorCode(errno);
    rc = false;
  }

  return rc;
}

void FileLogHandler::writeHeader(const char *pCategory,
                                 Logger::LoggerLevel level,
                                 const std::timespec *now) {
  char str[MAX_HEADER_LENGTH];
  m_pLogFile->writeChar(getDefaultHeader(str, pCategory, level, now));
}

void FileLogHandler::writeMessage(const char *pMsg) {
  m_pLogFile->writeChar(pMsg);
}

void FileLogHandler::writeFooter() {
  static int callCount = 0;
  m_pLogFile->writeChar(getDefaultFooter());
  /**
   * The reason I also check the number of log entries instead of
   * only the log size, is that I do not want to check the file size
   * after each log entry which requires system calls and is quite slow.
   * TODO: Any better way?
   */
  if (callCount % m_maxLogEntries != 0)  // Check every m_maxLogEntries
  {
    if (isTimeForNewFile()) {
      if (!createNewFile()) {
        // Baby one more time...
        createNewFile();
      }
    }
    callCount = 0;
  }
  callCount++;

  m_pLogFile->flush();
}

//
// PRIVATE
//

bool FileLogHandler::isTimeForNewFile() {
  return (m_pLogFile->size() >= m_maxFileSize);
}

ndb_off_t FileLogHandler::getCurrentSize() { return m_pLogFile->size(); }

bool FileLogHandler::createNewFile() {
  bool rc = true;
  int fileNo = 1;
  char newName[PATH_MAX];
  time_t newMtime, preMtime = 0;

  do {
    if (fileNo >= m_maxNoFiles) {
      fileNo = 1;
      BaseString::snprintf(newName, sizeof(newName), "%s.%d",
                           m_pLogFile->getName(), fileNo);
      break;
    }
    BaseString::snprintf(newName, sizeof(newName), "%s.%d",
                         m_pLogFile->getName(), fileNo++);
    newMtime = File_class::mtime(newName);
    if (newMtime < preMtime) {
      break;
    }
    preMtime = newMtime;

  } while (File_class::exists(newName));

  m_pLogFile->close();
  if (!File_class::rename(m_pLogFile->getName(), newName)) {
    setErrorCode(errno);
    rc = false;
  }

  // Open again
  if (!m_pLogFile->open()) {
    setErrorCode(errno);
    rc = false;
  }

  return rc;
}

bool FileLogHandler::setParam(const BaseString &param,
                              const BaseString &value) {
  if (param == "filename") return setFilename(value);
  if (param == "maxsize") return setMaxSize(value);
  if (param == "maxfiles") return setMaxFiles(value);
  setErrorStr("Invalid parameter");
  return false;
}

bool FileLogHandler::getParams(BaseString &config) {
  config.assfmt("FILE:filename=%s,maxsize=%llu,maxfiles=%u",
                m_pLogFile->getName(), (Uint64)m_maxFileSize, m_maxNoFiles);
  return true;
}

bool FileLogHandler::setFilename(const BaseString &filename) {
  close();
  delete m_pLogFile;
  m_pLogFile = new File_class(filename.c_str(), "a+");
  return open();
}

bool FileLogHandler::setMaxSize(const BaseString &size) {
  char *end;
  long val = strtol(size.c_str(), &end, 0); /* XXX */
  if (size.c_str() == end || val < 0) {
    setErrorStr("Invalid file size");
    return false;
  }
  if (end[0] == 'M') val *= 1024 * 1024;
  if (end[0] == 'k') val *= 1024;

  m_maxFileSize = val;

  return true;
}

bool FileLogHandler::setMaxFiles(const BaseString &files) {
  char *end;
  long val = strtol(files.c_str(), &end, 0);
  if (files.c_str() == end || val < 1) {
    setErrorStr("Invalid maximum number of files");
    return false;
  }
  m_maxNoFiles = val;

  return true;
}

bool FileLogHandler::checkParams() {
  if (m_pLogFile == nullptr) {
    setErrorStr("Log file cannot be null.");
    return false;
  }
  return true;
}
